﻿// Copyright (c) 2012-2013 fancidev
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Runtime.InteropServices;
using System.Security;
using System.Windows.Forms;

namespace Util.Forms
{
    public static class ControlExtensions
    {
        public static void SetWindowTheme(this Control control, string theme)
        {
            int hr = SafeNativeMethods.SetWindowTheme(control.Handle, theme, null);
            Marshal.ThrowExceptionForHR(hr);
        }

        public static void HideFocus(this Control control)
        {
            SafeNativeMethods.SendMessage(
                control.Handle, 
                WM_CHANGEUISTATE, 
                (IntPtr)(UIS_SET | (UISF_HIDEFOCUS << 16)),
                (IntPtr)0);
        }

        private const int WM_CHANGEUISTATE = 0x127;
        private const int UIS_SET = 1;
        private const int UIS_CLEAR = 2;
        private const int UIS_INITIALIZE = 3;
        private const int UISF_ACTIVE = 0x4;
        private const int UISF_HIDEACCEL = 0x2;
        private const int UISF_HIDEFOCUS = 0x1;
    }

    [SuppressUnmanagedCodeSecurity]
    static class SafeNativeMethods
    {
        [DllImport("uxtheme", ExactSpelling = true, CharSet = CharSet.Unicode)]
        internal static extern int SetWindowTheme(IntPtr hWnd, string textSubAppName, string textSubIdList);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.SysInt)]
        internal static extern void SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
    }
}
